Bury theatrical writer misses opening (5)
I believe the answer is:
inter
'bury' is the definition.
('inter' can be a synonym of 'bury')
'theatrical writer misses opening' is the wordplay.
'theatrical writer' becomes 'pinter' (Harold Pinter).
'misses opening' means to remove the first letter (I've seen 'missing opening' mean this).
'pinter' with its first letter taken away is 'INTER'.
(Other definitions for inter that I've seen before include "foreign footballers" , "get put down!" , "Prefix meaning in the middle" , "Put underground" , "Set deep" .)